/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.spark.ui.jobs

import javax.servlet.http.HttpServletRequest

import org.eclipse.jetty.servlet.ServletContextHandler

import org.apache.spark.SparkConf
import org.apache.spark.scheduler.SchedulingMode
import org.apache.spark.ui.JettyUtils._
import org.apache.spark.ui.SparkUI
import org.apache.spark.util.Utils

/** Web UI showing progress status of all jobs in the given SparkContext. */
private[ui] class JobProgressUI(parent: SparkUI) {
  val appName = parent.appName
  val basePath = parent.basePath
  val live = parent.live
  val sc = parent.sc

  lazy val listener = _listener.get
  lazy val isFairScheduler = listener.schedulingMode.exists(_ == SchedulingMode.FAIR)

  private val indexPage = new IndexPage(this)
  private val stagePage = new StagePage(this)
  private val poolPage = new PoolPage(this)
  private var _listener: Option[JobProgressListener] = None

  def start() {
    val conf = if (live) sc.conf else new SparkConf
    _listener = Some(new JobProgressListener(conf))
  }

  def formatDuration(ms: Long) = Utils.msDurationToString(ms)

  def getHandlers = Seq[ServletContextHandler](
    createServletHandler("/stages/stage",
      (request: HttpServletRequest) => stagePage.render(request), parent.securityManager, basePath),
    createServletHandler("/stages/pool",
      (request: HttpServletRequest) => poolPage.render(request), parent.securityManager, basePath),
    createServletHandler("/stages",
      (request: HttpServletRequest) => indexPage.render(request), parent.securityManager, basePath)
  )
}
